That appears to be the text from Wikipedia. I don't see the
difficulty; bent trees, both accidental and deliberately caused,
are common. Google with the words "bent trees", including the
quote marks, elicits wider information. My parents had a
weeping willow that was partly horizontal, and there's a tree
near my house that's about 45 degrees from vertical, although
I think that probably was just pushed over sometime, such as by
a car, and not put right.
Apparently one theory about your case is that somebody wanted some
wood that was grown in that shape, but, for whatever reason,
their project wasn't completed, and the trees grew full size.
I wonder how they stand up to storms - are they in a sheltered
position?